Transcript histology lab 3

Histology Lab 3
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Muscle Tissues
Muscle Tissue Facts
• Well vascularized
• Highly cellular tissues
• Responsible for most types of body movement
• Posses myofilaments which cause movement
or contraction in all cell types
Skeletal Muscle
Structure –
• Elongated cells
• Cells are multi-nucleated
• Nuclei are located on
the periphery
• Obvious striations
throughout.
Nuclei
Skeletal Muscle
Skeletal Muscle
Location –
• Attached to the skeleton
• Occasionally attached to
the skin
Skeletal Muscle
Skeletal Muscle
Function –
• Voluntary movement
• Warm blood as the
muscles produce heat.
• Locomotion
• Facial Expression
Skeletal Muscle
Smooth Muscle
Structure –
• Elliptically shaped cells
with a centrally located
nucleus
• There are no striations
present.
• Cells are close together
to form sheets.
Smooth Muscle
Location –
• Digestive tract
• Walls of the Uterus
• Blood vessel walls
Smooth Muscle
Function –
• Involuntarily controlled
• Produces involuntary
contractions through the
linings of the digestive tract
and ureters. This movement
is called peristalsis.
• Produces involuntary
contraction and expansion of
the blood vessels
(vasodilation /
vasoconstriction)
Cardiac Muscle
Structure –
• Centrally located nucleus
• Striated
• Has branching of muscle
cells with intercalated discs
• Involuntary control, control
is actually inherent so no
external stimuli is required
to cause contraction
Cardiac Muscle
Location –
• In the heart
Intercalated Disc
Cardiac Muscle
Function –
• To contract continuously
from inherent impulse.
• Involuntary contraction.
Nervous Tissue
Nervous Tissue Facts
• main component of the nervous system.
• Contains 2 major cells types:
1. Neurons – are highly specialized nerve cells that
generate and conduct nerve impulses.
2. Neuroglia – are supporting cells that are nonconducting that insulate and protect the neurons.
Nervous Tissue
Structure –
• Neurons are branching cells.
• Cell processes may be quite
long.
• Motor neurons have many
dendrites but one axon.
• Motor neurons are
myelinated.
• Cell body is called a cyton.
• Supporting connective tissue
is called Neuroglia
Cyton
Neuroglial Cells
Nervous Tissue
Location –
• Brain
• Spinal Cord
• Peripheral Nerves
Nervous Tissue
Function –
• coordinates activities
between the brain,
spinal cord and body
organs.
Cell Nucleus
Nucleus of
Neuroglial Cell
X – Section of Spinal Nerve
Epineurium – surrounds
several groups of
neurons.
Perineurium – surrounds a
group of neurons.
Perineurium
Epineurium
X – Section of Spinal Nerve
Endoneurium – is the
covering around one
neuron.
Axon – is the central grey
spot.
Myelin – is the white
surrounding the axon.
Endoneurium
Axon
X – Section of Spinal Cord
Central Canal
Meninges
White Matter
Grey Matter
1.) a.) Name the tissue type below.
b.) What type of cell is labeled B?
B
2.) a.) Where in the body would you find this tissue type?
b.) What protein accumulates in the cells as you approach the
apical surface of this tissue?
3.) a.) Name the cell type labeled A.
b.) Name the structure labeled B.
A
B
4.) a.) Name one function of this tissue type.
b.) Name one place in the body you would find this
tissue.
5.) a.) Name the fiber type labeled A.
b.) Name this tissue type.
A
6.) a.) What is the function of mast cells?
b.) What is the function of fibroblasts?
7.) a.) Name this tissue type.
b.) What is the function of the cell labeled B?
B
8.)a.) Where in the body would you find this tissue type?
b.) What protein is the fiber labeled B made from?
9.) a.) Name this tissue type.
b.) Name the structure labeled B.
B
10.) a.) Name this tissue type.
b.) Name one function of this tissue type.
EXAM NOTES
1. Exam runs on November 13th from 4-7pm.
2. It is in IB1101.
3. It will be a power point exam similar to the practice
tests.
4. You will have 1 minute per slide and 2 questions per
slide.
5. The exam should take 21 minutes to write.